Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/d3c9d47c1390
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #24691 from pivanov/bug-1076418

Bug 1076418 - Email Hyperlink is not themed

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https://hg.mozilla.org/integration/gaia-central/rev/b6d21cd71927
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1076418 - Email Hyperlink is not themed

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https://hg.mozilla.org/integration/gaia-central/rev/448084996548
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #24690 from gmarty/Bug-1074028-Overlapping-rocketbar-statusbar-icons-3rd-party-apps-2

Bug 1074028 - Overlapping rocketbar and statusbar icons for 3rd party ap...

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https://hg.mozilla.org/integration/gaia-central/rev/630e3fcbf525
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1074028 - Overlapping rocketbar and statusbar icons for 3rd party apps
Bumping manifests a=b2g-bump